GCCA Catskill Gallery — "Visitors, Visitations, Visions" combines sci-fi, fantasy and whimsy in a group show of works in all media by 17 Hudson Valley artists, through March 9, 398 Main St., Catskill. Hours 10 a.m.-5 p.m. Mon.-Sat. 518-943-3400. greenearts.org.

Karpeles Manuscript Library Museum — "Spiritualism," documents and manuscript materials from both Sir Arthur Conan Doyle and Harry Houdini on both sides of the issue of spiritualism, including material on seances, magic, and the opposing beliefs of the two men, through April 28. 94 Broadway, Newburgh. Also: "Up Close and Personal," works by F.T. Mitchell, through April 28. Hours 10 a.m.-4 p.m. Thurs.-Sat., noon-4 p.m. Sun. Free admission. 569-4997. karpeles.com.

Ramapo College — "It's the End of the World as We Know it (and I Feel Fine)," environmental-themed works by 14 artists, Kresge & Pascal Galleries, and landscapes by Gabriel Tempesta, Pascal Gallery, both through March 6, Berrie Center, 505 Ramapo Valley Road, Mahwah, N.J. Hours 1-5 p.m. Tues., Thurs. and Fri. and 1-7 p.m. Wed. 201-684-7844. ramapo.edu.

Wallkill Town Hall — Works of landscapes, farm animals and skyscapes by Sandy Spitzer, through March 31, 99 Tower Drive, Building A, Town of Wallkill. On view Mon.-Fri.; call for hours: 692-7800.

Washington's Headquarters State Historic Site — "Unpacked & Rediscovered: Selections From Washington's Headquarters' Collection," 84 Liberty St., Newburgh. New exhibit features more than 1,300 rare, curious, and important objects not seen by the public for many years. Admission $4, $3 senior citizens and students age 13 and older, free age 12 and younger. Hours 10 a.m.-3 p.m. Thurs.-Sat. 562-1195. facebook.com/washingtonsheadquarters.